Exoo, Geoffrey, and Milos Tatarevic. “New Lower Bounds for 28 Classical Ramsey Numbers”. The Electronic Journal of Combinatorics 22, no. 3 (July 17, 2015): #P3.11. Accessed April 13, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v22i3p11.